== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 15:04:42 (1763496282)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17792     1253512   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       24912     1246392   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       31012     3575980   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       14640     3592380   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       45652     7168360   1%  /mnt/lustre